Dynamo-electric machine.



W. F. DAWSON.

DYNAMO ELECTRIC MACHINE,

APPLICATION FILED my 5, 1905.

Patented Jan. 1911 s SEEMS- 33121" 1 W/TNESSES. I //v wax/rm."

. VWLA/AMFDAWMN ArrTK' W 3 Y bywgi W. P. DAWSON DYNAMO ELECTRIC MACHINE.

APPLICATION FILED MAY5. 1905. I

981,623. Patented Jan 17, 1911.

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w WilliamF Dawson.

W. F. DAWSON. 'DYNAMO ELECTRIC MACHINE. APPLIGATION FILED HAYS, 1905.

Patented Jan. 17, 1911.

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Wiiiiam F. Dawson.

UNITED STATES PATENT OFF-ICE.

WILLIAM F. DAWSON, E scHENEcrAnY,nEw YORK, ASSIGNOR '10 GENERAL ELEG- 7 ram COMPANY, A CORPORATION or NEW YORK.

DYNAMO-ELECTRIC MACHILIE:

Specification of Letters Patent.

Patented Jan. 17. 1911.

Application filed May 5, 1905. Serial No. 259,006.

To all whom it may concern:

Be it known that I, WILLIAM F. Dawson,

a citizen of the United States, residing at Schenectady, county of Schenectady, State of New -York, have invented certain new and useful Improvements in Dynamo-Electrio Machines, of which the following is a novel'features in the construction and arrangement of the ventilating means, the magnetic cores and the conductorsof such machines.

The various features of novelty which characterize my invention are pointed out with particularity inthe claims annexed to and forming apartof this specification. For a better understanding of my invention, however, reference may be had to the accompanying drawings and descriptive matter in which I have illustrated and described forms in which my invention may be embodied. I

Of the drawings, Figure 1 is a sectional elevation with parts broken away of a vertical shaft dynamo electric machine; Fig. 2 a sectional view illustrating the equalizer conductor construction; Fig. 3 is a diagram showing the equalizing conductor connections; Fig. 4 is a perspective View illustrating the connecting means between the equalizing conductors and the armature conductors proper; Fig. 5 is a lan view with parts broken away and in sec ion of the construction shown in Fig. 1; and Fig. 6 isa view with parts broken away and in section illustrating a modified construction.

In the particular construction shown in Figs. 1 to 5 of the drawings, I have shown my present invention embodico in an internal revolving armature direct current generator having its shaft adapted to be directly connected to the vertical shaft of a high speed prime mover such as a steam turbine.

The shaft 1 which as before stated is vertical has keyed upon it the hub 2 of a spider the arms 3 of which support the revolving laminated armature core 4. As is clearly shown in the drawings the, outer ends of the spider arms 3. are undercut at-3' to engage dovetail recesses 5 formed for the purpose in the core laminae. The spiderarms have formed at'theirouter ends projections 6 extending parallel with the shaft 1 which engage shoulders 6 formed on the inner surfaces of the radial portions of the end members 7 of the armature." The end members are clamped in place by bolts 8 and nuts 9.

able space blocks or ventilating strips 10 are placed at inter als in the laminated portions of the core to divide it into groups 11 separated by ventilating passages 12. Washers 13 are placed about the bolts 8 in the spaces between the groups of laminae 11 and between the end groups of lamina: and the end members 7.

In the construction illustrated in the draw The bolts 8 pass through holes formed for the purpose in the laminae. Suit-- ings, the laminae are of the usual segmental breaks joints. Between each adjacent pair (if recesses 5 a bolt 8 is located. It will be observed that with the particular construction illustrated a recess in each lamina is entered by a spider arm while some laminae engage two spider arms: With the construction illustrated the core is locked to the spider through the engagement of the undercut ends of the spider arm with the registering recesses 5 of the core, by the friction between the laminae and the end members due to the compression of the parts by the bolts '8, and by direct engagement of each segment with a number of bolts 8. In order to insure that each lamina properly engages the bolts 8 passing through it the holes or passages for the bolts 8 may be reamed out after the core is assembled. In order to prevent the magnetic flux carried by the core from setting up injurious eddy currents in the bolts 8, recesses 14- are extended from the inner surface of the core proper between the bolts 8, thus forming air gaps between the bolts. and materially reducing the flux passing through them. As shown, the recesses or air gaps 11 may be continuations of the undercut rccesses 5. formed to receive the ends of the spokes 3.

The end members 7 are provided with the usual cylindrical flange portions 15 which support the projecting ends of the armature conductors 16, the usual layer of insulating material 17 being provided between the periphery oi the flanges and the inner surl'aces of the conductors. The flange portion ol the lower end of member- 7 extends below the ends of the armature conductors lo and has formed in it a circumterentially extending depression or groove l8. In the depression or groove 18are located the equalizer conductors which are in the form of rings ltl. 'lhese rings are of course suitably insulated from each other and from the tlange. An annular member 20 is secured to the lower end of the tiange portion of the lower end member in any suitable manner as by means of bolts tapped into' the ends ofthe llange. The annular member 20 serves to lock the equalizer conductors or rings firmly in place. i Clips or connectors 21 extend from appropriate points l1 the armature winding to each equalizer l'ing. I prefer to form the connectors 21 in the manner clearly shown in w Figs. 2 and 1. In this construction the connector 21 is in the form of a bar of condu'cting material the lower end of which is looped i around the appropriate equalizer ring to 1 which it may be secured by-rivets22. The body portion of the bar 2t passes over the top of the equalizer ring to which it is connected and over the tops of any rings which may be located above its ring and extends into the lower end of the sheet metal clip 23 which surrounds and connects the lower ends of a pair of armature conductors 10. In order to improve the electrical connection the ends of the conductors 16, the end of the connectorQl, and the clip may be soldered. together; The connectors 2L are covered by a layer of insulating material and are bound lirmly in place in any suitable manner as by means of a la yer of binding wire 21%. It will of course be understood that the usual means such as the layer of binding wire 29 are employed for preventing radial displacement of l the conductors 1G. The construction just described possesses many important advantages. The connections between the equalizer rings and the armature conductors are short. The equalizer c'omluctors are protected against nie chanical injury and from dirt, and are S! cured in place along with the connectors ll by n ans which prevent disydacement under the inlluenceoflhe centrifugal force generated at high speed. The upper ends of the conductors l6 are eonl'iected to the commutator bars 25 by radially extending conductors 27. The commutator bars are bound against their supporting shell 26 by shrink rings 28. As shown, the lower shrink ring 28 is just above the inner ends of the eoiuluetors 27. This arrangement tends to prevent the en trance oi. dirt with its conserpicnt disadvantages into the f lhli' 'fi between the extreme inner ends ot' the condo-"tors 27 and also pret l l l i l l t l vents mechanical injury to the lower ends ot the conductors 27 as tor instance by the m ans employed il or lubricating the eonume tator surface from time to time.

In the particular construction illustrated in Figs. 1 to 5 inclusive, the external lield ring 330 has adjustably secured to i internally projecting solid pole pieces Sl about which the usual windings 232 are placed. The inner ends of the solid pole piece portions 31 have undercut grooves formed in their faces extending parallel to the axis of rotation of the armature. A. laminated. pole piece portion 33 is secured to the inner end of each pole piece Si by means of tenons 33 formed for the purpose on the outer edges ol the lamime ll olf the portion 2'??- which extend into undercut slots :l'ormed in the inner end .t'rom the pole pieces. The laminar llare divided into groups separated by ventilating space blocks or spacing strips As shown the extreme inner ends of the strips 35 are not radial but are inclined to be parallel to the air currents set up by the armature.

Assuming that the armature rotates in the direction indicated by the arrow in liig. 5, the air set in motion by the arnmtnr; and passing into the ventilating spaces 35' formed by the spacing strips 35 has a direction of motion which is neither wholly radial nor wholly tangential. but. has both a radial and a tangtmtial component. The direction of the air Clll'l'tzlllS entering the ventilating spaces 35 is shown by the small arrows in Fig. The inner ends ot the separators may be reverselyinclined to the body of the separator in theinner ends as shown, though this is not essential. In the form of my invention shown in the drawings the laminated polar portions :33 are slotted to receive compensating windings :16, and the space blocks 35 are arranged one between each adjacent air of slots.

To the field ring 30 or member l0 engaging its lower end is secured an annular mem her ll, theplane of which is transverse to the shall; 1. To the inner end of the member ll is secured a downwardly extending cylindrical drum or member el'Z. The inner edge 01 the annular member 'l'l is located slightly beyond the inner ends of the solid pole piece portions ill. Fan blades l secured to the. lower end of the cylindrical portion 15 of the lower end member 7 generate air eurrents which pass vertically downward through the machine to cool it. The member 41 and drmn l2 serve as a. casing for the tan blades l3 thereby increasing the effcctiveness'ot the latter.

ln order to get the best ventilating ellects l have .l'ound it desirable to' make the internal diameters ol? the end members 7 unequal. As shown the upper member 7 has a comparatively large opening through which the spider. Through this passage a certain amount of air passes downward from the space within the armature core. By making the opening in the upper member 7 much larger than the opening in the lower memher 7 as just described, the bulk of the air entering the space wit-hm the armature core through the upper opening is caused to pass certain of the lamime of the core.

radially out of the armature care through the ventilating spaces. A small quantity of air, however, passes through the opening in the lower member and assists in cooling the underside of the armature core. further advantage of employing a small air passage through the lower member 7 is that it tends to prevent the formation of comparatively stationary .hot air in the space within the armature core adjacent the lower end memher 7 and. gives a more equal flow of air through the various passages 12.

In the construction shown in Fig. 6 I .ave shown an internal field member 45 'evolvingin the direction shown by the arge arrow. The cooperating external lanrii'iated armature core 46 supported by the frame or ring 47 has formed in it ventilating paces by ventilating strips or spacers .18 inserted in the usual manner between The inner ends oi the blocks or spacers 48 are ar-' ranged parallel to the line of movement of the air set in motion by the revolving field. As shown, these space blocks may be substantially the same as those shown in Fig. 5 and may be arranged one between each adjacent pair of slots 49 in which the. armature conductors are located. The use of fbarriers or deflectors such as'are formed by ihe bent inner ends of the space blocks in the coi'istruction shown, located in the ventilating spaces of the stationary core and extending substantially parallel to-the direction of the air currents generated by the revolving member of the machine, materially increases the flow of air through the ventilating ducts and thereby produces a more ellicient cooling of the machine. The

increased flow of air due to the use of these barriers or deflectors is largely due to the fact that they decrease whirls or eddy currents of air in the space between the revolving and stationary members of the machine.

'hi'lc l have hereinbetore described and illustrated somewhat in detail the best form of my invention now known to me, it will be obvious that changes may be made in the 'form of the embodiment disclosed without departing from the spirit of my invention and that certain features of my invention may sometimes be used without a corresponding userof other features of my invention. What I-claim as new and desire to seem by Letters Patent ofthe United States, is,-

1. In a dynamo electric machine, an internal rotating member, an external stationary member, said stationary member having a core portion or portions formed of'laminated material separated into groups with ventilating spaces between the groups, and deflectors or barriers located in said spaces, the ends of said barriers or deflectors adjacent the revolving member being inclined to the radial direction and substantially parallel to the line of motion of the air set in motion by the revolving body,

2. In a dynamo electric machine, an internal rotating member and an external stationary member, said stationary member having a core portion or portions provided with a ventilating space, a deflector or barrier located in said ventilating space, the endof said deflector or barrier adjacent the revolving member being pa allel to a'line' which dividesthe angle between the radial and tangential components of the motion at the end of the deflector of the air moved 'by the revolving member.

3. In a dynamo electric machine. a rotating shaft, a member carried thereby, a cooperating annular stationary member surrounding the first, an annular dislclike memher the peripheral edge of which is secured to the stationary member. a cylindrical drum concentric with the shaft secured to the inner edge of said annular member, the.

internal diameter of, said drum being slightly greater than that of said stationary member, and fan vanes or blades secured to the shaft carried member and extending beyond the periphery of the body portion thereof, said vanes or blades being located within said drum.

4.,In a dynamo electric machine, an internal rotating 'member, and an external stationary member, said stationary member having a core portion or portions formed of laminated material separated at intervals by space blocks or separators to form ventilating spaces, the ends of said space blocks adjacent the revolving member being inclined to the radial direction and substantially parallel to the line of motion of the air set in motion by the revolving body.

In an armature, a laminated cbre, an end member therefor provided with a cylindrieal flange adapted to support the ends of the armature conductors, said flange having a circumferentially extending groove or depression formed in it, and an equalizing conductor located in said groove or depression..

6. In an armature, a core, a winding therefor, an armature head provided with. a

, flux passing throuL'h said bolts.

end conn cted to th appropriate ring and llange for supporting theendR of said windl inn, equalizing conductors in the form. otj 'inga al o mounted on :said flange, conned I lions hetwee i l T. ln an armature, a core, eoinlnetors theretor in the form of bars, the ends, of certain ot eald hare hei connected together in pairs by sheet metal clips or shells 1 surrounding them, a support for the ends oi the bars whi h project beyond thecore proper, equalizing rings carried by' said:

support. and connections between said rings and said conductors each 01' said conneci litllla' comprising a bar or strap ha run; one

the other end pas-1 d into the clip or shell rurrouinling the appropriate pair of bars.

in. in an armature. a laminated core, an end member ther touprorided with a llauge, arnnu nre conductors resting at one end upon said tlaugg'e, said llange having a circumt'er-- ential groore or tlejil'tHSiOll formed therein, t and an equalizing conductor arranged in} hilltl n'roore er depression. t l'n an :unzalure. a core. a windinnw llierethr. a support tor the ends ot said winding. and equalizing conductors in the form of ring- 1 mounted on said support heyond the ends ol' aid armature conductors. 1

ll). In an armature a core a winding theret'or. a support tor the ends of said winding, equalizing conductors in the form ol' rings mounted on said support. a layer of nmnlatiug material snrroinidiug the equalizing conductors, and a binding band or hande :t'or securing the insulating material aud'rii s in place.

ll. in au armature a core, a head therefor proYidt-d with a cylindrical fiance portion, a depression formed in the end ot the flange portion remote from the core, equalizing rings located in said depression and an an nular member secured to the ends; of said flange to hold the equalizing rings n place.

12. ln'eoinbiuation, a laminated annular ('oi'e harine' reeessea termed in its inner curred nurt'aee. a Spider having arms, the ends ot which extend into said recesses, and bolts passing through said core;said recesses being extended to form slots' limiting the 1 ln eouihinalion, a laminated core havin;- slots formed in itextending transverselr to the plaue ot lamination a Supporting through said core parallel to and between adjacent slots, saidslots being extended to lorin an gaps tending to prevent; the core I flux from passing through said bolts.

ll. In combination, a laminated core having slots formed in it extending transversely to the planes of lamination the outer portions of the sides of said slots being undercut, a supporting memberfor thepore havingundercut projections which enter the undercut portions of said slots. said hlots being extended to i'orm relatively deep air gaps in said core at the inner sides of. the

projections.

15. In a dynamo electric machine, an internal rotating member, an external stationary member, said stationary member having a core portion or portions provided with ventilating passages, the ends of said paseages adjacent the revolving member being parallel to a line which divides the angle between the radial and tangential mmponents ol the motion ol' the airmored by the re volring member.

16. ln an armature, a core. a headthQretor provided with a oylindrical flange, armature conductors resting: at one end upon said tlanr e. said tlange having a depression 1 t'ormed therein beyond the ends of the arnne ture emnluctors,and equalizing rings 10- eated in said depression.

17. in an ar iature, a'core, a head there for prornled with a evhndrical flange porlion, armature conductors having one end supported upon said flange portion, said flange portion having a deprei sion formed therein at the end remote from the core, equalizing rings located in said depression,

and an annular member secured to the end 0t aaid flange portion to hold the erptalizine rings in place.

18. The combination with a slotted armature core, a supporting structure therefor having an annular reee and a Winding in the core slots, of a plurality of flat ring eonductors located side by side in the recess, sheet metal clips t'astenedto the ends of armature conductors eorrespomling t0 equi potential points of the winding. and strap conductors having their ends 'tastened to said sheet metal clips and to mrrespom'lin flat ring comluetors.

In witness whereof. l have hereunto set my hand this 3rd day of h'lay, L905.

\VILLTAM l DAll'SON.

Witnesses:

BHNJAMIN B. lltm. llunnn Onronn. 

